Question

我应该还在练习Java Swing吗？
我正在尝试通过添加更改笔刷颜色的选项来向Java Swing Paint应用程序添加功能。但是，当我在颜色选择器中选择了另一种颜色时，所有旧标记都会与我的新线标记一起变为所选颜色。我希望旧标记保持与以前相同的颜色。

（下面的图片）

Both the old AND new lines change to green.

这不是整个应用程序（如果需要，请告诉我），但是我认为问题与表操作不正确有关。将颜色与线条匹配的“ shapeFill”表（“ shapes”表）无法正常工作。

   public class TestPane extends JComponent{

    private List<List<Point>> points;
    private ArrayList<Shape> shapes = new ArrayList<Shape>();

    public TestPane() {

        points = new ArrayList<>(100);

        MouseAdapter ma = new MouseAdapter() {

            private List<Point> currentPath;

            @Override
            public void mousePressed(MouseEvent e) {
                currentPath = new ArrayList<>(100);
                currentPath.add(e.getPoint());

                points.add(currentPath);
            }

            @Override
            public void mouseDragged(MouseEvent e) {
                Point dragPoint = e.getPoint();
                currentPath.add(dragPoint);
                repaint();
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                currentPath = null;
            }

        };

        addMouseListener(ma);
        addMouseMotionListener(ma);
    }


    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        Iterator<Color> fillCounter = shapeFill.iterator();
        for(Shape s : shapes) { // I believe problem is somewhere around here?
            g2d.setPaint(fillCounter.next());
            g2d.setStroke(new java.awt.BasicStroke(10));
        }

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        for (List<Point> path : points) {
            Point from = null;
            for (Point p : path) {
                if (from != null) {

                    Shape line = new Line2D.Float(from.x, from.y, p.x, p.y);
                    g2d.draw(line);
                    shapes.add(line);
                    shapeFill.add(lineColor);
                }
                from = p;
            }
        }
        g2d.dispose();
    }

}

public JButton createButton(String title) {
     JButton button = new JButton(title);
     button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {

                if(e.getSource() == colorChooser) {
                    Color chooser = JColorChooser.showDialog(null, "Select color", lineColor);
                    lineColor = chooser;
                    shapeFill.add(chooser);
                    repaint();
                }else if(e.getSource() == shapeFillArrayList) {
                    System.out.print("\n");
                    for(Color index : shapeFill) {

                        System.out.println(index);
                    }
                }
            }

     });

     return button;
}

我的Java Swing Paint应用程序中的颜色更改很麻烦

0 个答案: